All-fiber wind measurement laser radar apparatus baed on asymmetric M-Z interferometer and method

A wind-measuring lidar and fiber laser technology, which is used in measurement devices, instruments, fluid velocity measurement, etc., can solve the problems of demanding stability of lasers and M-Z interferometers, increasing the dynamic range of frequency shift measurement, and increasing M-Z interferometers. , to achieve the effects of insensitivity to laser energy fluctuations, large dynamic range of wind speed measurement, and compact structure

Inactive Publication Date: 2015-11-04
UNIV OF SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

The fiber optic M-Z interferometer overcomes the shortcomings of the space optical M-Z interferometer, such as being greatly affected by vibration, not compact in structure, and complex in optical path adjustment.
However, in the commonly used wind lidar based on symmetrical M-Z interferometers, the laser needs to be locked at the half-waist of the M-Z interferometer. Therefore, it has strict requirements on the stability of the laser and the M-Z interferometer.
Moreover, since its measurement needs to be limited to the half-waist, in order to increase the dynamic range of frequency shift measurement, it is necessary to increase the free spectral spacing of the M-Z interferometer, which leads to a decrease in measurement sensitivity

Method used

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  • All-fiber wind measurement laser radar apparatus baed on asymmetric M-Z interferometer and method
  • All-fiber wind measurement laser radar apparatus baed on asymmetric M-Z interferometer and method
  • All-fiber wind measurement laser radar apparatus baed on asymmetric M-Z interferometer and method

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Embodiment 1

[0030] figure 1 A schematic structural diagram of an all-fiber wind-measuring lidar based on an asymmetric M-Z interferometer provided in Embodiment 1 of the present invention; figure 1 As shown, it mainly includes:

[0031] Continuous fiber laser 1, fiber isolator 2, EOM 3 (intensity modulator), arbitrary function generator 4, EDFA 5 (fiber amplifier), fiber circulator 6, time-delay fiber 7, optical transceiver and scanning system 8, fiber Bragg Grating 9, 2×2 fiber coupler 10, fiber M-Z interferometer 11, piezoelectric ceramic 12, piezoelectric ceramic driver 13, 3×3 fiber coupler 14, first detector 16, second detector 17, third Detector 18, acquisition card 19 and computer 20; Wherein:

[0032]The output end of the continuous fiber laser 1 is connected to the input end of the fiber isolator 2, the output end of the fiber isolator 2 is connected to the input end of the EOM 3, the output end of the EOM 3 is connected to the input end of the EDFA 5, and the arbitrary functio...

Embodiment 2

[0080] An embodiment of the present invention provides an all-fiber wind detection lidar wind measurement method based on an asymmetric M-Z interferometer. The asymmetric M-Z interferometer formed by the fiber coupler is used as the frequency discriminator of the wind lidar; the differential-cross multiplication demodulation method is used to extract the Doppler frequency shift information; the method of changing the arm length of the piezoelectric ceramic is used to realize the M-Z interference of the fiber The self-calibration of the instrument; the time-division multiplexing method is used to determine the laser emission frequency by collecting the backscattering cursor of the time-delayed optical fiber. The invention has compact structure, strong anti-interference ability, does not need to lock the relative position of M-Z interferometer and laser frequency, is insensitive to laser energy fluctuation, has high energy utilization rate, and has a large dynamic range of wind s...

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Abstract

The invention discloses an all-fiber wind measurement laser radar apparatus based on an asymmetric M-Z interferometer and a method. On one hand, an asymmetric M-Z interferometer formed by a 2*2 fiber coupler and a 3*3 fiber coupler is used as a frequency discriminator of a wind measurement laser radar; compared with Fabry-Perot interferometer, the M-Z interferometer has advantages like high transmittance and large detectable wind speed dynamic scope; compared with traditional space optical profile type M-Z interferometer, the M-Z interferometer provided by the invention has advantages like strong anti-interference capability, compact structure, stable system and convenient light modulation etc.; compared with symmetrical M-Z interferometer based on 2*2 fiber coupler, there is no need to lock the laser at the halfway point of the M-Z interferometer, therefore, the measurement sensitivity can be raised by reducing the free spectrum spacing of the M-Z interferometer; on the other hand, the demodulation method of differential intersect multiply by is adopted, and the energy injected into the MZI is normalized, therefore, the solution is not sensitive to the fluctuating of the laser energy.

Description

technical field [0001] The invention relates to the technical field of direct detection Doppler wind measuring laser radar, in particular to an all-fiber wind measuring laser radar device and method based on an asymmetric M-Z interferometer. Background technique [0002] Wind lidar is of great significance to improve the accuracy of long-term weather forecasts, storm forecasts, improve climate research models, and improve military environment forecasts. Therefore, the measurement of atmospheric wind field has received more and more attention. Organizations such as the International Civil Aviation Agency, the World Meteorological Organization, and aerospace research institutions in various countries are actively carrying out research and development of wind field detection systems. [0003] Doppler wind lidar can be divided into coherent detection (also known as heterodyne detection) and direct detection (also known as incoherent detection) according to different detection pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/26
Inventor 夏海云上官明佳任佳恩王冲裘家伟窦贤康薛向辉
Owner UNIV OF SCI & TECH OF CHINA
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